Definition of cadenza in English:

noun

He remains silent in the melancholy slow movement but recovers for the finale, a virtuoso cadenza for solo violin and percussion, the violinist consoled at the end by two clarinets.

In the 20th century some players inserted wildly inappropriate cadenzas in Classical concertos, either displaying flashy technique or modulating to keys so remote as to wreck the tonal balance of the movement.

He takes up a treasured tradition by playing his own cadenzas in both concertos.